flesh out serde2::json

serde2/src/json/builder.rs

@@ -0,0 +1,131 @@
+// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use std::collections::TreeMap;
+use std::str::StrAllocating;
+
+use ser::{mod, Serialize};
+use json::value::{mod, Value};
+
+pub struct ArrayBuilder {
+    array: Vec<Value>,
+}
+
+impl ArrayBuilder {
+    pub fn new() -> ArrayBuilder {
+        ArrayBuilder { array: Vec::new() }
+    }
+
+    pub fn unwrap(self) -> Value {
+        Value::Array(self.array)
+    }
+
+    pub fn push<T: ser::Serialize>(mut self, v: T) -> ArrayBuilder {
+        self.array.push(value::to_value(&v));
+        self
+    }
+
+    pub fn push_array(mut self, f: |ArrayBuilder| -> ArrayBuilder) -> ArrayBuilder {
+        let builder = ArrayBuilder::new();
+        self.array.push(f(builder).unwrap());
+        self
+    }
+
+    pub fn push_object(mut self, f: |ObjectBuilder| -> ObjectBuilder) -> ArrayBuilder {
+        let builder = ObjectBuilder::new();
+        self.array.push(f(builder).unwrap());
+        self
+    }
+}
+
+pub struct ObjectBuilder {
+    object: TreeMap<String, Value>,
+}
+
+impl ObjectBuilder {
+    pub fn new() -> ObjectBuilder {
+        ObjectBuilder { object: TreeMap::new() }
+    }
+
+    pub fn unwrap(self) -> Value {
+        Value::Object(self.object)
+    }
+
+    pub fn insert<K: StrAllocating, V: ser::Serialize>(mut self, k: K, v: V) -> ObjectBuilder {
+        self.object.insert(k.into_string(), value::to_value(&v));
+        self
+    }
+
+    pub fn insert_array<S: StrAllocating>(mut self, key: S, f: |ArrayBuilder| -> ArrayBuilder) -> ObjectBuilder {
+        let builder = ArrayBuilder::new();
+        self.object.insert(key.into_string(), f(builder).unwrap());
+        self
+    }
+
+    pub fn insert_object<S: StrAllocating>(mut self, key: S, f: |ObjectBuilder| -> ObjectBuilder) -> ObjectBuilder {
+        let builder = ObjectBuilder::new();
+        self.object.insert(key.into_string(), f(builder).unwrap());
+        self
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use std::collections::TreeMap;
+
+    use json::value::Value;
+    use super::{ArrayBuilder, ObjectBuilder};
+
+    #[test]
+    fn test_array_builder() {
+        let value = ArrayBuilder::new().unwrap();
+        assert_eq!(value, Value::Array(Vec::new()));
+
+        let value = ArrayBuilder::new()
+            .push(1i)
+            .push(2i)
+            .push(3i)
+            .unwrap();
+        assert_eq!(value, Value::Array(vec!(Value::I64(1), Value::I64(2), Value::I64(3))));
+
+        let value = ArrayBuilder::new()
+            .push_array(|bld| bld.push(1i).push(2i).push(3i))
+            .unwrap();
+        assert_eq!(value, Value::Array(vec!(Value::Array(vec!(Value::I64(1), Value::I64(2), Value::I64(3))))));
+
+        let value = ArrayBuilder::new()
+            .push_object(|bld|
+                bld
+                    .insert("a".to_string(), 1i)
+                    .insert("b".to_string(), 2i))
+            .unwrap();
+
+        let mut map = TreeMap::new();
+        map.insert("a".to_string(), Value::I64(1));
+        map.insert("b".to_string(), Value::I64(2));
+        assert_eq!(value, Value::Array(vec!(Value::Object(map))));
+    }
+
+    #[test]
+    fn test_object_builder() {
+        let value = ObjectBuilder::new().unwrap();
+        assert_eq!(value, Value::Object(TreeMap::new()));
+
+        let value = ObjectBuilder::new()
+            .insert("a".to_string(), 1i)
+            .insert("b".to_string(), 2i)
+            .unwrap();
+
+        let mut map = TreeMap::new();
+        map.insert("a".to_string(), Value::I64(1));
+        map.insert("b".to_string(), Value::I64(2));
+        assert_eq!(value, Value::Object(map));
+    }
+}